Moves volume icon update in the timer
[vlc.git] / modules / audio_filter / channel_mixer / simple.c
1 /*****************************************************************************
2  * simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
3  *****************************************************************************
4  * Copyright (C) 2002, 2006 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@videolan.org>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27
28 #include <vlc/vlc.h>
29 #include <vlc_aout.h>
30
31 /*****************************************************************************
32  * Local prototypes
33  *****************************************************************************/
34 static int  Create    ( vlc_object_t * );
35
36 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
37                         aout_buffer_t * );
38
39 /*****************************************************************************
40  * Module descriptor
41  *****************************************************************************/
42 vlc_module_begin();
43     set_description( _("Audio filter for simple channel mixing") );
44     set_capability( "audio filter", 10 );
45     set_category( CAT_AUDIO );
46     set_subcategory( SUBCAT_AUDIO_MISC );
47     set_callbacks( Create, NULL );
48 vlc_module_end();
49
50 /*****************************************************************************
51  * Create: allocate trivial channel mixer
52  *****************************************************************************/
53 static int Create( vlc_object_t *p_this )
54 {
55     aout_filter_t * p_filter = (aout_filter_t *)p_this;
56
57     if ( (p_filter->input.i_physical_channels
58            == p_filter->output.i_physical_channels
59            && p_filter->input.i_original_channels
60                == p_filter->output.i_original_channels)
61           || p_filter->input.i_format != p_filter->output.i_format
62           || p_filter->input.i_rate != p_filter->output.i_rate
63           || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
64     {
65         return -1;
66     }
67
68     /* Only conversion to Stereo and 4.0 right now */
69     if( p_filter->output.i_physical_channels !=
70         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) 
71         && p_filter->output.i_physical_channels !=
72         ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
73         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
74         {
75             return -1;
76         }
77
78     /* Only from 7/7.1/5/5.1 */
79     if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
80         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
81          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
82         (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
83         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
84          AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
85          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
86     {
87         return -1;
88     }
89
90     p_filter->pf_do_work = DoWork;
91     p_filter->b_in_place = 0;
92
93     return 0;
94 }
95
96 /*****************************************************************************
97  * DoWork: convert a buffer
98  *****************************************************************************/
99 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
100                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
101 {
102     int i_input_nb = aout_FormatNbChannels( &p_filter->input );
103     int i_output_nb = aout_FormatNbChannels( &p_filter->output );
104     float *p_dest = (float *)p_out_buf->p_buffer;
105     float *p_src = (float *)p_in_buf->p_buffer;
106     int i;
107
108     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
109     p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
110
111     if( p_filter->output.i_physical_channels ==
112                             (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
113     {
114         if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
115         for( i = p_in_buf->i_nb_samples; i--; )
116         {
117             *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
118             p_dest++;
119             *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
120             p_dest++;
121
122             p_src += 7;
123
124             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
125         }
126         else
127         for( i = p_in_buf->i_nb_samples; i--; )
128         {
129             *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
130             p_dest++;
131             *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
132             p_dest++;
133
134             p_src += 5;
135
136             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
137         }
138     }
139     else
140     {
141         if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
142         for( i = p_in_buf->i_nb_samples; i--; )
143         {
144             *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 6;
145             p_dest++;
146             *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 6;
147             p_dest++;
148             *p_dest = p_src[2] / 6 +  p_src[4];
149             p_dest++;
150             *p_dest = p_src[3] / 6 +  p_src[5];
151             p_dest++;
152
153             p_src += 7;
154
155             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
156         }
157         else
158         for( i = p_in_buf->i_nb_samples; i--; )
159         {
160             *p_dest = p_src[4] + 0.5 * p_src[0];
161             p_dest++;
162             *p_dest = p_src[4] + 0.5 * p_src[1];
163             p_dest++;
164             *p_dest = p_src[2];
165             p_dest++;
166             *p_dest = p_src[3];
167             p_dest++;
168
169             p_src += 5;
170
171             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
172         }
173
174     }
175 }